- Country: United States
- Sport: Triathlon
- Height: 6'3" / 1.91m
- Weight: 161 lbs / 73.0 kg
- Born: 5/4/1976
- Hometown: Colorado Springs, CO, USA
- Career Highlights: The most prominent male triathlete in U.S. history, Kemper joins Canada’s Simon Whitfield and Germany’s Anja Dittmer as the only athletes to qualify for all four Olympics since the sport was added to the program in 2000. The 36-year-old punched his ticket to London by placing fifth in a time of 1 hour, 49 minutes, 17 seconds at an ITU World Series race in May. "I didn't know if I would actually be back here, I went through so much - it's been a struggle," said Kemper, who returned to action for the first time since suffering a broken elbow during an American Cup event last October. Kemper has improved his performance in each successive Olympiad: He finished 17th in his Sydney debut, then was ninth in 2004 and crossed the line seventh four years ago with a personal Olympic-best 1:49:48.75. The only American male triathlete ever to be ranked No. 1 in the world by the ITU in 2005, Kemper won a silver medal at the 1999 Pan American Games and gold in the same competition in 2003. He won a record seventh men's elite national championship in 2011.
- Previous Olympics: 2008,2004,2000